Nowadays, no one could deny the urgency of the major environmental problems, particularly global warming and climate change, because of the threat to humanity’s existence. The cause is the unprecedented greenhouse gas emissions, mostly carbon dioxide, from major anthropogenic activities leading to the augmentation of the greenhouse effect. The effects on humans and the environment include food and water scarcity, biodiversity loss, leading to premature extinction, rising sea levels, rapid spread of deadly viral diseases and extreme weather conditions.

Garcia, M. N. Z., & Cobar-Garcia M. R. V. (2016, October 2). Need for environmental literacy. The Philippine Daily Inquirer, p. A16.